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OF   THE 

UNIVERSITY   OF   CALIFORNIA. 

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California  Electric  Light  Co., 

Incorporated  June  30th,  1879- 


OWNEI^S  AND  SOLE  AGENTS  FOI^THE  nZj^f^Mm^... 


FOR    THE 


Brush  Electric  U^^^ 


>< 


JOHN  BENSLEY.  O.  F.  WILLEY. 

R.  A.  ROBINSON.  WILLIAM  KERR. 

J.  R.  HARDENBERGH. 


J.  R.   HARDENBERGH, 

President. 

M.  D.   LAW, 


GEORGE  H.  ROE, 

Secretary. 

Superintendent. 


COMPANY'S    OFFICE, 

427  MONTGOMERY  ST.,  S.  F. 


SAN    FRANCISCO 


mmJ       Spattlding  &  Williams,  Steam  Book  and  Job  Pkintebs,  414  Clay  Street,        -sClC 


879. 


California  Electric  Light  Co., 

Incorporated  June  SOth^  1879' 

OWNEF^S  AND  SOLE  AGENTS  FO^THE  PACIFIC  COAST 

FOR   THE 

Brush  Electric  Light. 


Directors: 

JOHN  BENSLEY.  O.  F.  WILLEY. 

R.  A.  R0I3INSCJN.  WILLIAM  KERR. 
J.  R.  HARDENBERGH. 

J.  R.   HARDENBERGH,  GEORGE  H.  ROE, 

President.  Secretary^ 

M.   D.   Lx\W,         -         -         -  Superintendent.            ''  P*  ^^' 


^""-^^^^  -^ 


COMPANY'S    CJ  F  F  I  C  K  , 

427  MONTGOMERY  ST.,  S.  F. 


SAN  FKANCISCO: 
Spaulding  &  Williams,  Steam  Book,  Card  and  Job  Printers, 

"Mining  and  Scientific  Press"  OflQce,  4U  Clay  Street. 
1879. 


Digitized  by  the  Internet  Archive 

in  2008  with  funding  from 

IVIicrosoft  Corporation 


http://www.archive.org/details/circularOOcalirich 


liJlectric  Light, 


9 

We  desire  to  respectfully  call  your  attention,  and  solicit  your 
co-operation  with  us,  in  advancing  the  interests  of  the  California 
Electric  Light  Company. 

Our  object  is  to  deal  in  and  manufacture  Generators,  Lamps, 
and  any  and  all  devices  that  may  be  desirable  to  practically  util- 
ize the  coming  light  of  the  age,  Electricity,  thereby  developing 
its  commercial  value. 

After  examining  all  the  lights  and  devices  for  generating 
electric  light,  we  have  decided  that  the  Brush  Generator  and 
Electric  Light  is  equal,  if  not  superior  to  any  in  use,  and  have 
made  satisfactory  arrangements  with  the  owners. 

We  mean  to  be  on  the  alert,  keeping  up  with  all  the  improve- 
ments of  the  age,  either  by  purchase  or  otherwise.  Our  actual 
object,  (as  it  should  be  in  all  commercial  ventures,)  will  be  to 
control  the  best  there  is,  supply  the  demand  for  Generators  and 
Lamps,  and  furnish  Light  at  a  price  that  will  insure  its  use. 

Our  company  has  already  demonstrated  to  their  satisfaction 
that  the  said  light  can  be  produced  and  distributed  at  a  net  cost 
of  one-third  what  it  costs  to  produce  Gas  Light,  and  in  quality 
greatly  superior. 

After  looking  over  the  matter  fully,  with  due  deliberation,  we 
have  decided  that  we  can  make  a  success  of  the  business,  and 
are  therefore  justifiable  in  calling  your  attention  to  this  sub- 
ject, and  solicit  co-operation  and  investment  that  will  surely 
prove  remunerative  in  the  near  future. 


THE    BRUSH   ELECTRIC   LIGHT. 


The  attention  of  manufacturers  and  others  who  have  occasion 
to  use  artificial  light  to  any  considerable  extent,  is  called  to  the 
great  economy  in  cost,  and  the  great  increase  in  light,  afforded 
by  the  BEUSH  ELECTRIC  LIGHT  APPARATUS.  There  are 
many  situations  in  which  it  alone,  of  all  the  various  artificial 
lights,  can  do  the  work  of  illumination  satisfactorily  not  only 
because  it  costs  less,  but  because  it  furnishes  a  volume  of  light 
obtainable  in  no  other  way.  Such  situations  are  Rolling  Mills, 
Iron  Foundries,  Moulding  Shops,  and  all  Factories  where  there 
are  large,  high  ceiling  rooms,  as  well  as  Docks,  Warehouses, 
Depots,  Open  Spaces,  etc.  In  such  places  Electric  Light  has 
been  used  to  very  great  advantage — very  largely  used  abroad, 
and  now  to  an  increasing  extent  in  this  country.  There  are 
other  Factories,  Mills,  Shops,  large  Stores,  Hotel  Offices,  The- 
atres, Public  Halls,  etc.,  in  which  gas  or  oil  has  been  used,  and 
they  have  furnished  a  sufficient  amount  of  light;  but,  when  all 
the  cost  is  counted  up  and  the  result  compared,  not  only  with 
the  cost  but  with  the  other  great  advantages  of  Electric  Light,  it 
is  found  that  the  latter  has  the  decided  advantage,  and  it  is 
slowly  but  surely  occupying  the  field.  There  are  still  other 
places  in  which,  when  the  cost  of  the  necessary  power  to  drive 
the  machine,  taken  in  connection  with  the  fact  that  a  compara- 
tively small  amount  of  light  is  needed,  in  a  number  of  rooms,  or 
for  a  very  short  time  each  day,  are  considered,  it  will  be  found 
that  Electric  Light  possesses  no  advantage  in  point  of  cost  over 
other  lights,  yet  still  retains  its  value  as  a  pure  white  light,  giv- 
ing no  heat  and  free  from  danger  of  explosion. 

So  far  as  the  Brush  apparatus  is  concerned,  it  may  be  stated 
with  confidence  that  the  experimental  stage  has  been  passed.  It 
has  taken  its  place  among  the  practical  lights  of  the  day,  and  is 


rapidly  being  introduced  into  locations  where  its  peculiar  ad- 
vantages make  it  the  cheapest  and  best  light.  It  is  not  offered 
for  domestic  purposes,  because  in  dwellings  it  is  not  as  cheap  as 
gas  or  oil,  and  is  not  yet  adapted  to  such  uses. 

The  apparatus  consists  of  a  Dynamo-Electric  Machine,  which 
generates  the  current  of  electricity,  and  Electric  Lamps  or  regu- 
lators for  holding  and  feeding  the  carbon  points,  which,  by 
their  consumption  in  the  voltaic  arc,  produce  the  light.  Both 
are  the  invention  of  Charles  F.  Brush,  M.  E.,  of  Cleveland,  a 
gentleman  of  the  most  extensive  and  accurate  scientific  attain- 
ments, especially  in  the  field  of  Dynamo -Electricity.  By  the 
highest  scientific  authorities  in  this  country  they  have  been  given 
the  first  place  among  all  machines  or  apparatus  of  this  kind  now 
in  practical  use. 

Points  of  Excellence. 

The  prominent  points  in  which  the  Brush  Machine  excels  all 
others  of  its  class,  are  the  following: 

1st.  It  produces  the  greatest  amount  of  light  in  proportion 
to  the  power  used  in  driving  the  machine,  and  the  least  amount 
of  heat  in  the  machine  itself. 

2d.  It  is  more  simple  in  its  construction,  and  less  liable  to 
require  repairs,  being  fully  as  durable  in  all  respects  as  the 
highest  grade  of  steam  engines. 

3d.  A  single  Brush  Machine  will  produce  any  number  of 
lights  desired,  from  one  up  to  twenty,  all  in  one  circuit,  all 
equally  steady. 

The  peculiar  points  of  excellence  in  the  Electric  Lamps  or 
Regulators  are  the  following: 

1st.  They  are  entirely  automatic  in  their  action,  keeping  the 
carbon  points  at  the  exact  distance  from  each  other  that  pro- 
duces the  best  effect  and  feeding  them  down  regularly  until  en- 
tirely consumed,  without  requiring  the  slightest  attention  or 
adjustment. 

2d.  Not  a  trace  of  clockwork,  or  mechanism  of  that  charac- 
ter, or  any  complex  parts,  are  used  in  the  lamps,  and  their  ac- 
tion is  controlled  entirely  by  the  current.     When  finished  and 


6 

shipped  from  the  factory,  they  are  ready  to  put  up  and  start 
running  without  change  or  adjustment. 

3d.  By  a  very  simple  and  ingenious  device  added  to  the 
lamps  that  are  to  be  burned  a  number  at  a  time  in  a  single  cir- 
cuit, no  one  lamp  can  get  more  than  its  share  of  the  total  cur- 
rent, but  all  burn  with  equal  steadiness  and  power.  Another 
device  provides  for  any  possible  accident  that  may  prevent  one 
lamp  from  burning  properly,  from  interfering  with  the  others  in 
the  same  circuit,  for,  by  its  operation,  that  lamp  is  automatically 
cut  out  of  the  circuit  until  it  is  ready  to  burn  properly  again, 
when  it  is  automatically  cut  into  circuit,  all  without  interfering 
with  any  other  lamp. 

4th.  The  lamps  are  so  constructed  that  the  light  may  be  used 
with  its  full  power,  or  a  ground  glass  or  opal  globe  may  be  used 
to  reduce  its  intensity  or  power  to  any  required  degree.  It  is 
thus  adapted  for  use  in  all  places  where  a  light  of  great  power, 
or  a  more  diffused  and  softened  light,  is  needed. 

Cost  and  Advantages. 

The  cost  of  light  produced  by  this  apparatus  consists  of  the 
following  items:  Cost  of  power  to  run  the  machine;  cost  of  at- 
tendance upon  engine  and  machine;  wear  and  tear  of  apparatus; 
cost  of  carbons  burned  in  the  lamps.  The  first  two  items  would 
vary  with  the  location  and  circumstances.  Where  power  is  in 
use  for  other  purposes,  and  there  is  a  small  surplus  which  can 
be  used  for  running  the  machine,  no  additional  expense  is  in- 
curred, and  the  first  two  items  may  be  omitted  from  the  account. 
The  wear  and  tear  of  the  electrical  apparatus  is  not  four  per 
cent,  per  year — far  less  than  in  most  moving  machinery.  This 
comes  from  the  fact  that  the  Brush  Apparatus  is  the  simplest 
and  most  durable  yet  brought  out.  Even  a  cursory  examination 
shows  this.  The  expense  for  carbons  consumed  in  each  lamp 
varies  from  three  cents  to  five  cents  per  hour.  Where  cost  of 
power  and  attendance  may  be  omitted,  and  large  spaces  are  to 
be  lighted,  the  saving  over  gas  is  great,  falling,  under  circum- 
stances, favoring  the  electric  light,  to  as  low  as  one-twentieth  the 
cost  of  an  equal  amount  of  gas-light. 


The  great  advantage  possessed  by  Electric  Light,  over  all  its 
rivals,  for  the  illumination  of  places  where  considerable  light  in 
large  rooms  or  spaces  is  desired,  is  now  generally  conceded. 
The  light  is  pure  white,  and  therefore  gives  natural  colors  to  all 
objects  or  materials  illuminated  by  it.  It  does  not  vitiate  the 
atmosphere  by  giving  off  volumes  of  carbonic  acid  gas,  and  other 
non-respirable  gases,  as  do  gas  and  oil.  An  equal  amount  of 
gas  light  produces  about  two  hundred  times  as  much  heat. 
^  There  are  no  dangers  in  its  use  at  all  corresponding  to  those 
due  to  leaky  gas-pipes,  defective  meters,  exploding  lamps,  etc. 
In  places  adapted  to  its  use,  it  is  by  far  the  cheapest  light  that 
can  be  obtained.  It  is  the  "  coming  light,"  the  latest  wonder  of 
the  nineteenth  century. 

Comparison  with  Foreign  Systems. 

Comparisons  of  the  Brush  Apparatus  with  the  best  of  the  sys- 
tems in  use  in  Paris,  of  which  so  much  has  been  written  of  late, 
are  favorable  to  the  American  system. 

The  Jablochkoff  Candle,  as  ordinarily  used  there,  is  placed  in 
a  glass  globe  on  a  post  ten  feet  high,  and  gives  a  light  equal  to 
700  candles.  One  candle,  burning  an  hour  and  a  half,  costs  fif- 
teen cents.  If  light  is  needed  for  a  longer  time,  a  fresh  candle 
must  be  substituted  each  hour  and  a  half.  If  the  candle  is  ac- 
cidentally extinguished,  it  does  not  re-light  itself,  as  does  the 
Brush  lamp,  but  must  be  re-lit  by  hand.  A  Brush  lamp  of  3,000 
candle-power,  costs  four  cents  per  hour  for  carbon  consumed,  or 
less  than  one-third  the  cost  of  the  700  candle-power  light  pro- 
duced by  the  Jablochkoff  candle.  If  the  Brush  lamp  is  acci- 
dentally extinguished,  it  instantly  re-lights  itself,  and  it  requires 
attention  only  once  in  burning  twelve  hours  continuously,  where- 
as the  Jablochkoff  candle  would  require  attention  seven  times  in 
the  same  interval. 

So  great  has  been  the  appreciation  of  the  Brush  Electric  Light 
Apparatus,  as  a  practical  substitute  for  gas  and  oil,  for  the  illu- 
mination of  places  suited  to  its  use,  that  over  five  hundred  lights 
have  already  been  sold  for  actual  use,  although  it  is  less  than  a 
year  since  the  first  order  was  filled.     Some  of  the  largest  and 


8 

most  important  factories  and  mills  in  the  country  are  using  it 
daily,  or  rather  nightly,  in  their  regular  business,  and  with  the 
most  satisfactory  results  both  as  to  economy  and  facility. 

About  nine-tenths  of  the  Electric  Lights  actually  purchased 
and  in  use  to-day,  in  this  country,  are  Brush  Lights,  and  it  is 
difficult  to  keep  up  with  orders  for  the  sizes  of  machines  most 
in  demand. 


THE  TELEGRAPH  SUPPLY  COMPANY 

Have  the  exclusive  control  of  the  manufacture  and  sale  of  this 
Apparatus,  and  their  factory,  occupying  five  floors  50x100,  with 
two  engines,  two  boilers,  and  a  full  outfit  of  modern  machinery, 
enables  them  to  carry  on  all  branches  of  the  manufacture,  from 
the  crude  material  to  the  completed  machines,  in  the  most  per- 
fect manner. 

During  the  dark  hours  of  the  day  and  in  the  early  evening, 
the  factory  and  office  are  illuminated  exclusively  by  the  Brush 
Light,  and  all  other  lights  dispensed  with.  The  building  is 
thus  made  conspicuous  by  its  brilliant  illumination,  and  attracts 
crowds,  not  of  idlers  only,  but  of  substantial  business  men,  to 
see  a  practical  illustration  of  its  value. 

The  actual  cost  to  the  company  for  the  illumination  of  three 
floors,  including  the  office,  does  not  exceed  ten  cents  per  hour^ 
and  their  gas  bills,  for  a  smaller  amount  of  light,  would  be  not 
less  than  one  dollar  per  hour. 


Where  the  Light  can  be  Used 


Having  been  fully  perfected  so  as  to  produce  Electric  Light  in 
a  perfectly  practical  manner,  at  a  cost  below  that  of  any  other 
artificial  light,  and  with  the  most  complete  safety,  we  are  pre- 
pared to  make  propositions  for  its  introduction  into  localities 
where  considerable  light  is  needed.  The  places  where  this  light 
can  be  used  with  the  greatest  economy,  and  where  it  is  certain, 
sooner  or  later,  to  supplant  all  other  illuminating  agents,  are 
FACTORIES,  MILLS,  SHOPS,  DEPOTS,  PARKS,  DOCKS, 
OPEN  SPACES,  CHURCHES,  PUBLIC  HALLS,  THEATRES, 
STORES,  etc.,  and  also  in  LIGHT-HOUSES;  and  as  HEAD- 
LIGHTS for  STEAMERS,  FERRY-BOATS  and  LOCOMO- 
TIVES; also,  for  prejecting  VIEWS,  DIAGRAMS,  etc.,  in 
Lectures  upon  Scientific  and  other  subjects. 

Electric  Light  is  pure  white,  and  therefore  gives  day  colors  to 
all  objects  viewed  by  it.  An  equal  amount  of  gas  or  oil  light 
produces  nearly  two  hundred  times  as  much  heat  and  carbonic 
acid  gas,  and  costs  from  four  to  twenty  times  as  much  as  the 
Electric  Light.  There  is  no  danger  of  fire  or  explosion  in  its 
use. 

Parties  desiring  to  use  Electric  Light  for  the  above  or  similar 
purposes,  are  invited  to  send  us  full  particulars  regarding  the 
buildings,  rooms  or  places  to  be  lighted,  including  dimensions, 
character  of  walls  and  ceilings,  amount  of  available  power  and 
its  location,  amount  of  light  now  used,  character  of  work  being 
done,  length  of  time  light  will  be  needed  continuously,  etc. ,  etc- 

With  these  items  before  us,  we  will  make  a  proposition  to  fur- 
nish a  COMPLETE  OUTFIT  FOR  ELECTRIC  LIGHT,  put  it 
in  perfect  working  order,  and  guarantee  its  success  and  perma- 
nence. Opportunity  will  be  given  to  test  the  apparatus  thor- 
oughly before  concluding  the  purchase. 

The  fullest  investigation  and  the  most  exhaustive  comparative 
tests  satisfy  us  that  our  apparatus  is  the  BEST  now  before  the 
public,  and  that  the  BRUSH  DYNAMO-ELECTRIC  MACHINES 
and  BRUSH  AUTOMATIC  CARBON  REGULATORS  are,  so 
far,  unequaled. 


10 

Extracts  from  Report  of  the  Conamittee  on 
Dynamo -Electric  Machines  of  the  Franklin 
Institute  of  Philadelphia. 

The  Brush  machine  has,  for  its  magnetic  field,  two  horseshoe 
electro- magnets,  with  their  like  poles  facing  each  other,  at  a  suit- 
able distance  apart,  the  circular  armature  rotating  between 
them. 

In  this  machine  the  currents  are  generated  in  coils  of  copper 
wire,  wound  upon  an  iron  ring,  constituting  the  armature.  This 
ring  is  not  entirely  covered  by  the  coils,  as  in  the  Gramme  arm- 
ature, but  the  alternate  uncovered  spaces  between  the  coils  are 
almost  completely  filled  by  iron  extensions  from  the  ring,  thus 
exposing  large  surfaces  of  the  armature  ring  for  the  dissipation 
of  heat,  due  to  its  constantly  changing  magnetism,  as  in  the 
Pacinotti  machine. 

The  ring  revolves  between  the  poles  of  two  large  field  mag- 
nets, the  two  positive  poles  of  which  are  at  the  same  extremity 
of  the  diameter  of  the  armature,  and  the  two  negative  poles  at 
the  opposite  extremity,  each  pair  constituting  practically  ex- 
tended poles  of  opposite  character. 

The  coils  on  the  armature  ring  are  eight  in  number,  opposite 
ones  being  connected  end  to  end,  and  the  terminals  carried  out 
to  the  commutator.  In  order  to  place  the  commutator  in  a  con- 
venient position,  the  terminal  wires  are  carried  through  the  cen- 
ter of  the  shaft  to  a  point  outside  the  bearings. 

The  commutators  are  so  arranged,  that,  at  any  instant,  three 
pairs  of  coils  are  interposed  in  the  circuit  of  the  machine,  work- 
ing, as  it  were,  in  multiple  arc,  the  remaining  pair  being  cut  out 
at  the  neutral  point;  while  in  the  Gramme  machine,  the  numer- 
ous armature  coils  being  connected  end  to  end  throughout,  and 
connections  being  made  to  the  metal  strips  composing  the  com- 
mutator, two  sets  of  coils  in  multiple  arc  are  at  one  time  inter- 
posed in  the  circuit,  each  set  constituting  one-half  of  the  coils  on 
the  armature. 

The  commutator  consists  of  segments  of  brass,  secured  to  a 
ring  of  non-conducting  material,  carried  on  the  shaft.     These 


11 

segments  are  dmded  into  two  thicknesses,  the  inner  being  per- 
manently secured  to  the  non-conducting  material,  and  the  outer 
ones,  which  take  all  the  wear,  are  fastened  to  the  inner  in  such 
a  manner  that  they  can  be  ensily  removed  when  required. 

The  commutator  brushes,  which  are  composed  of  strips  of 
hard  copper,  joined  together  at  the  outer  ends,  are  inexpensive 
and  easily  renewed.  The  machines  are  simple  in  construction, 
all  the  working  parts  being  easily  accessible,  and  the  cost  of  the 
maintenance  low. 


Copy  of  Report  to  Prof.  John  Trowbridge, 

Chairman  Committee  on  Philosophical,  Mathematical,  and  other 
Instruments,  at  the  Fair  of  Massachusetts  Charitable  Mechanics 
Association,  Boston,  September  and  October,  1878. 

At  10.30  p.  M.,  on  Friday,  the  25th  of  October,  1878, 1  applied 
the  Richard  Thompson  Indicator  to  the  "Brown"  Steam  Engine 
on  exhibition,  to  ascertain  the  power  required  to  drive  the  Elec- 
tric Light  on  exhibition.  I  used  a  pair  of  instruments  which  I 
believe  to  be  correct,  one  on  each  end  of  the  cylinder,  and,  with 
the  assistance  of  Mr.  C.  H.  Brown,  took  six  pair  of  diagrams, 
simultaneously  at  each  test.  The  diagrams  were  completed  from 
the  reading  of  Amsler's  Polar  Planimeter,  with  the  following 
result,  namely: 

Power  required  to  drive  one  Brush  machine,  said  by  them  to 
be  equal  to  four  lights — 6.448  horse  power;  being  equal  to  1.112 
horse  power  for  each  light.  (The  No.  5,  12,000  candle  Brush 
machine,  giving  4,  5  or  6  lights.) 

Power  required  to  drive  one  Wallace-Farmer  machine,  said  by 
them  to  be  equal  to  three  lights,  10.6976  horse  power,  being 
equal  to  3.5658  horse  power  for  each  light.  (The  8  inch,  6,000 
candle  machine.) 

Power  required  to  drive  one  Wallace-Farmer  machine,  said  by 
them  to  be  equal  to  five  lights,  16.3705  horse  power,  being  equal 
to  3.274  horse  power  for  each  light.  (The  9  inch,  10,000  candle 
machine.) 


12 


RECAPITULATION. 

1  Brush  machine,  4  lights,  6.448  horse  power;  1.112  h.p.  per  light 
lWal.-Farm.  "    3      ''      10.6976         **  3.568*' 

1         "  "    5      "      16.3705         "  3.274  '' 

The  series  of  diagrams  I  retain  as  my  vouchers.     If  the  com- 
mittee require  them,  they  are  at  their  order. 
Kespectfully  submitted. 

F.  W.  BACON,  Consulting  Engineer. 
8  Pemberton  Square,  Boston. 


Manufacturers  and  others  desiring  to  use  Electric  Light,  are 
requested  to  send  to  us  full  particulars  regarding  the  buildings, 
rooms  or  places  to  be  lighted,  including  dimensions,  character 
of  walls  and  ceilings,  amount  of  available  power,  amount  of 
light  now  used  or  needed,  character  of  work  being  done,'  etc. 
With  these  items  before  us,  we  will  make  a  proposition  to  fur- 
nish a  complete  outfit  for  electric  light,  put  it  in  perfect  working 
order,  and  guarantee  its  success  and  permanence.  Attention  is 
called  to  the  following  letters  from  well-known  establishments 
using  our  apparatus,  as  the  best  possible  evidence  of  its  entirely 
practical  success.  We  have  already  sold  500  lights  for  actual 
use. 


Franklin  Institute. 

At  the  conclusion  of  a  long  and  exhaustive  trial  at  the  Frank- 
lin Institute,  in  Philadelphia,  a  complete  report  on  Dynamo- 
Electric  Machines  was  presented  by  a  special  committee  of  nine 
members,  strongly  favoring  the  Brush  Machine,  and  its  pur- 
chase was  recommended  for  the  uses  of  the  Institute,  which 
recommendation  was  immediately  carried  out.  The  only  Amer- 
ican machine — the  Wallace — competing  with  the  Brush,  was 
shown  to  be  less  than  one-third  the  efficiency  of  the  Brush,  and 
heated  so  greatly  as  to  be  seriously  impeded  in  working. 


13 

From  the  Riverside  Worsted  Mills,  Providence,  R.  I. 

Providence,  April  12,  1879. 
Brush  Electric  Light  Co.,  Boston: 

Gentlemen — In  reply  to  your  inquiries  concerning  our  expe- 
rience with  the  machines  of  your  company  with  which  we  are 
lighting  our  mill,  we  would  say:  We  have  in  daily  use  the  two 
No.  7  Brush  Electric  Light  Machines  which  we  bought  of  you, 
and  we  have  ordered  a  third  of  the  same  size.  Each  machine 
lights  sixteen  lamps.  These  give  us  perfect  satisfaction,  the 
light  being  very  steady  and  much  better  for  our  weavers  to  work 
by  than  gas-light.  Before  the  introduction  of  the  electric  light 
we  burned  in  our  weaving  room  230  gas  burners,  consuming 
some  1,200  feet  of  gas  per  hour,  which  at  the  price  we  pay  for 
gas,  $2.25  per  M.  less  8  per  cent.,  amounted  to  $2.48  per  hour. 
We  have  now  lighted  the  same  room  for  some  time  with  twenty 
Brush  lights,  which  cost  us  for  carbons  consumed,  twenty  cents 
per  hour  (at  the  reduced  price  for  carbons).  This  does  not  in- 
clude the  cost  of  power.  We  have  not  as  yet  indicated  the 
horse  power  of  either  machine,  but  think  they  cannot  take  over 
14  to  15  horse  power  each.  We  are  informed  by  the  Merrimack 
Manufacturing  Co.,  of  Lowell,  Mass.,  who  have  a  machine  of 
the  same  size  as  ours  and  running  the  same  number  of  lights, 
that  their  machine  requires  13  86-100  horse  power. 
Truly  yours, 

FEEDERICK  CONDICT,  Treasurer. 


From  the  Willimantic  Thread  Co.,  Willimantic,  Conn. 

WiLLiMANTiG,  CoNN.,  March  11,  1879. 
Brush  Electric  Light  Co.,  Boston: 

Gentlemen — The  six-light  electric  machine  which  we  put  in 
our  Willimantic  Mill  is  running  to  our  satisfaction.  We  have 
two  lights  in  our  winding  room,  68  by  80  feet,  and  four  in  the 
mule  room,  68  by  200  feet,  where  we  are  spinning  No.  140  cot- 
ton.    The  entire  cost  is  about  equivalent  to  gas  at  $1  per  thou- 


14 


sand  feet — the  light  far  better.  I  inclose  a  photograph  taken 
in  the  winding  room  after  midnight,  which  gives  a  very  good 
idea  of  the  power  of  the  light. 

Yours, 

W.  E.  BAKROWS,  Treasurer. 


Fr6ni  the  Deer  Creek  Mine,  near  Smartsville,  Cal. 

San  Francisco,  April  24,  1879. 
Brush  Electric  Light  Co.: 

Gentlemen — I  have  just  returned  from  the  Deer  Creek  Mine, 
near  Smartsville,  which  is  now  lighted  at  night  by  three  lanterns 
of  3,000  candle  power  each,  supplied  from  a  Brush  Electric  Ma- 
chine furnished  by  you.  The  light  thus  produced  enables  the 
company  to  work  the  mine  at  night  practically  as  well  as  by  day. 
The  machine  requires  but  little  attention  and  the  expense  is 
small.  Should  the  apparatus  continue  to  work  as  well  as  at 
present,  the  company  will  be  entirely  satisfied. 
Yours  truly, 

GEO.  P.  THURSTON,  Secretary. 


From  Senator  Wm.  Sharon,  owner  of  Palace  Hotel. 

San  Francisco,  April  24,  1879. 
Brush  Electric  Light  Co.  : 

Gentlemen — I  have  been  using  ten  electric  lights  at  the  Palace 
Hotel,  furnished  from  one  No.  4  and  one  No.  5  Brush  machine, 
using  about  10  horse-power.  The  lights  are  placed  as  follows: 
Two  3,000  candle  lamps  in  the  Court,  displacing  510  gas  jets, 
two  1,000  and  one  3,000  candle  lamps  in  the  grand  dining  room, 
displacing  280  gas  jets;  one  1,000  candle  lamp  in  the  restaurant; 
displacing  150  gas  jets;  one  1,000  candle  lamp  in  the  office,  dis- 
placing 100  gas  jets;  one  1,000  candle  lamp  in  kitchen,  displac- 
ing 20  gas  jets,   one  1,000  candle  lamp  in  bar-room,  displacing 


15 

25  gas  jets;  one  3,000  candle  lamp  in  front  of  the  hotel.  The 
lamps  in  the  dining  room  are  switched  from  there  to  the  front 
of  the  hotel,  and  to  the  bar-room  after  the  dinner  hour,  and  all 

ARE  WORKING  TO    OUR    ENTIRE    SATISFACTION .      We    f CCl   f rCC    to    statC 

that  the  Brush  Electric  Light  is  a  cheap,  practical  light  to  use 
where  much  light  is  needed. 

Yours  truly, 

WM.  SHARON. 
San  Francisco,  Cal.,  August  12,  1879. 


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14  DAY  USE 

RETURN  TO  DESK  FROM  WHICH  BORROWED 
LOAN  DEPT. 

This  book  is  due  on  the  last  date  stamped  below,  or 

on  the  date  to  which  renewed. 

Renewed  books  are  subject  ta  immediate  recall. 


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